When you're old enough you can answer this one yourself.
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You can, but 10 is very young to be concerned with such things.
9 to the 12th power would be 9 * 9 * 9 * 9 * 9 * 9 * 9 * 9 * 9 which would equal 282 429 536 481
= 90 (9*10)
9+9 and 9+9+9+9+9
81